Earlier this month, reports alleged that a former Oxfam director had hired prostitutes and hosted a sex party at a villa paid for by the charity during a humanitarian mission in Haiti in 2011.

Roland van Hauwermeiren—who left the charity in 2011 during a sexual misconduct inquiry—has also been accused of hiring sex workers during a humanitarian mission in Chad. Van Hauwermeiren denies the claims, stating that he had "intimate relations" with a woman who was not a sex worker. "I'm not a saint, I'm a man of flesh and blood and have made mistakes (not easy to admit), and I am deeply ashamed," van Hauwermeiren wrote in an open letter.

In a statement, Oxfam says that hiring van Hauwermeiren was a "serious error" and "should never have happened." "We are still checking how this occurred but it further highlights that we need an organisation and sector-wide approach to the vetting and recruitment of both staff and consultants, especially in emergencies where there is pressure to fill posts quickly in order to help save lives," the statement continued.

In the wake of the scandal, Oxfam could now lose its UK and EU funding, and the UK charity commission has launched an inquiry into reports that Oxfam "covered up" sexual misconduct cases in Haiti.

Many of the charity celebrity ambassadors—including Minnie Driver and Desmond Tutu—have resigned as a result of the allegations.

But, Simon Pegg has said he will stand by the charity as he is worried about "the people that are going to suffer" if too many people distance themselves from the charity.

"Oxfam is an organisation which helps countless people. I think it would be wrong to hold the entire organisation to account for the actions of a few people," says Pegg. "I worry about the people that are going to suffer if everybody abandons this charity."

He added that he respects the charity enormously and said the people he's dealt with have "been nothing short of heroes to me."

"This isn't something that was done by Oxfam. This was done by some morally reprehensible people who managed to infiltrate Oxfam. To punish Oxfam, I think, is wrong," he says.

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